I bought a case of fusible batting from Connecting Threads. The directions say to mark your quilt "after" fusing...well, like you I followed the directions and thought I had sufficiently fused the layers. After a day of handling it, it started coming apart! I couldn't re fuse it because I was afraid the heat would set my marks making the marks permanent. I wasted another day hand basting it back together. Now I will baste the other 5 bags I have and chalk it up to a lesson learned :-o